Improvement in pistons



L. RICHNER.

PISTON.

No. 192,715. Patented July 3,1877.

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- ATTORNEY$ NVPETERS, PHDTO-LITHOGRAFHER. WASHINGTON. By C,

UNITED STATES PATENT OFFICE.

LEVI RIOHNER, OF MANSFIELD, ILLINOIS.

' IMPROVEMENT IN PISTONS.

Specification forming part of Letters Patent No. 192,716, dated July 3,1877; application filed J ans 2, 1877.

To all whom it may concern: a

, Be it known that I, LEVI RIGHNER, of Mansfield, in the county ofPiatt-and State of Eli clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a .part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawings is a representation of the cylinder with thehead removed. Fig. 2 is a longitudinal vertical sectional view of thecylinder. Figs. 3 and 4 are plan views of the piston-heads; andFig. 5 isa perspective view of the spring.

My invention relates to pistons for steamcylinders, pumps, air-brakes,or any purpose where the packing is set out by cams; and it consists inthe construction and arrangement of devices for setting out the packing,as will be hereinafter more fully'set forth.

The annexed drawing, to which reference is made, fully illustrates myinvention.

A represents the cylinder in which the pis-' ton moves. B is thepiston-rod, O (l the heads, and D D the ordinary split packing-rings. Gis the hub, placed on the rod B between the heads 0 O, and withinthe-packing-rings..

The periphery ofthis hub is formed of a series of cams, a a, of equalsize and shape, as shown. I

Opposite each cam-surface a is placed a flat metal spring, b,.ofsemi-elliptic shape, which spring has in the center of its lower edge aprojecting lug, b, which enters a corresponding hole or cavity, as, inthe head (3, thereby preventing the springs from moving, but causingthem to remain in the same place.

The ends of the springs b I) bear against the inside of thepacking-rings, pressing the same outward.

The packing-rings D D are set out by turning the cam-hub G, whichoperates on all the springs b b simultaneously and equally-that is, theyare all set out the same distance from the center at one operation. Thehub is then fastened by means of screws 01 d passing through slots 6 inthe hub into the head 0.

The hub G is made hollow, as shown, and fits around a concentricshoulder, h, formed on the inside of the head 0, so that it will alwaysremain in true position.

Any desired number of springs may be used according to the size ofpiston, the hub having always a corresponding number of cam-surfaces, a.

After the cam-hub has been thus adjusted, as described, the head 0 isput on and fastened by means of screws m.

What I claim as new, and desire to secure by Letters Patent, is-- Thecombination of the head 0, provided with recesses 00 and splitpacking-rings D,

with the hub Gr having a series of cam-shaped surfaces, 0., formed onits periphery, and a corresponding number of springs, b, -provided withlugs b, substantially as described, and for the purpose set forth.

In testimony that I claim the above l have hereunto subscribed my namein the presence 7 of witnesses.

LEVI BIOHNER.

Witnesses:

J. BENDER, O. R. SMYTHE, E. A. BARRINGER.

